What is an example of a theme in The Crucible, and what are some examples that show how Arthur Miller develops that theme?

Another theme in The Crucible is hunger for power. Both Reverend Parris and Thomas Putnam are exemplary of this. Reverend Parris is described in the exposition of the play as a man who "felt insulted if someone rose to shut the door without first asking his permission." He frets over the possible loss of his position, where he holds great power over a fanatically religious community. Before becoming a clergyman, Parris was a merchant in the Barbados, where he obtained his "Negro slave," Tituba.
While Reverend Parris represents the hunger for power within the religious community, Thomas Putnam represents the hunger for power among landowners. Though there is no animus between Parris and Putnam, Putnam wants his brother-in-law, James Bayley, to be the minister of Salem. Putnam is described as "the eldest son of the richest man in the village." He also considers himself smarter than everyone around him, which makes him doubly offended that the community overlooks his candidate for the ministry. Putnam also tries to break his father's will, due to it leaving "a disproportionate amount to a stepbrother." Putnam was a vindictive man before the witch trials began, but he later uses the panic and persecution of other villagers to his benefit to seize the land of those who are accused, tried, and killed in the witch hunts.

A single theme evident in The Crucible observes that in a climate of mass hysteria, the rights of individuals are sacrificed.  Though the theocratic law of Puritan Salem operated on the tenet that the accused were assumed guilty until proven innocent, the magistrates accepted spectral evidence as hard proof that the accused were practicing witchcraft.  Once spectral sight was entered into evidence, there was no recourse for the accused.  The accused were not allowed legal representation, seen in Act III when Judge Danforth proclaims, "the pure in heart need no lawyers," and when Hale implores Danforth to let the accused have lawyers, Danforth derides him by saying, "Mr. Hale, believe me; for a man of such terrible learning you are most bewildered."  The mass hysteria gripping Salem and the desperation of the theocratic authority to maintain its power and legitimacy combined to deprive the accused people of Salem their rights, and in some cases, their lives.